Control your presentation with your Smartphone, iPad or Apple Watch. For this, you need to install PPTControlDesktop on the device with the presentation and start the service. Now you can select the device on the iPhone. While selecting, a request is sent to the device, which must be accepted with the PPTControlDesktop application. You can block new requests after successful pairing, so that only you can control the presentation.
You can download PPTControlDesktop at https://bastian-aunkofer.com/pptcontroldesktop.

Conditions:
The control requires a Bluetooth connection, so the device with the presentation as well as the smartphone must support Bluetooth.
To take control via Apple Watch, the iPhone must be connected to the device with the presentation (This is required due to Apple's restrictions on the Apple Watch).
More information at https://bastian-aunkofer.com/pptcontrol.